The Echinoid Directory

Family Echinoneidae Agassiz & Desor, 1847, p. 143

Diagnosis

Echinoneina with:

  • Periproct large and oral; midway between peristome and periproct;
  • Ambulacra narrowing towards peristome; no expansion of pore-pairs.
Range
Eocene to Recent, Caribbean and Indo-Pacific region.
Remarks
Distinguished from Pygaulidae by the extreme simplicity of the ambulacra adorally, and by the more adoral position of the periproct.